This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
A wide variety of products are used in the coffee-growing area of Colombia to correct soil acidity, but the information about their quality is insufficient. This research aimed to evaluate the efficiency of commonly used amendments applied on coffee plots in Colombia to correct soil acidity. Thirty products, classified as agricultural, dolomitic and quenched limestones, phosphoric rocks, agricultural gypsum and those obtained from the mixture of various compounds, were selected. The variables evaluated were: neutralization power (PN), particle size efficiency (EG), moisture content (H), calcium (Ca), magnesium (Mg) and total relative neutralization power (PRNT); additionally, the incubation test determined the effect of the products on the correction of soil acidity and the contribution of Ca and Mg. Agricultural, dolomitic and quenched limestones showed H values between 0.0% and 0.6%, PN between 93% and 120%, EG between 62% and 96% and PRNT between 62% and 115%. Phosphoric rocks showed low capacity to correct acidity (PN between 3% and 22%, NRP between 9% and 16%), as well as agricultural gypsum (PN of 32%, NRP of 23%). The soil pH, evaluated in the incubation test, and the PRNT of the products showed high correlation (R2 =0.92), a result that suggests the use of this parameter to establish the efficiency of amendments used to correct soil acidity.